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  1. #1

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    4-Tec crankcase pressure?

    Hi Guys,

    Im still working through trying to figure out why I have oil in my supercharger inlet hose, and through my intercooler hoses and inlet manifold

    http://www.greenhulk.net/forums/showthread.php?t=270888

    So, I have taken the charger apart, and didn't find anything out of the ordinary at all (its only about 10-15 hours old since it was last built).

    I put it back together, and am now wanting to do a little test. I want to imitate the positive pressure of the crankcase, to see if get any oil seeping through the seals.

    If you refer to the attached photo, you'll see that I have attached a high pressure hose to the rear of the charger, and clamped it to the housing where it would normally seal when bolted into the motor. The high pressure hose has an air line fitting on the top of it, which will allow me to pressurize the back of the charger. I have filled about a quarter of the hose with oil. I also have the front housing off, and the impellor wheel. This will allow me to see any seepage.



    My problem is, I don't know how much pressure to give it. Can anybody tell me what the minimum and maximum safe level of pressure the crankcase would ever get to?.

    Cheers guys.

    Dave
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  2. #2
    Anything over 4psi is excessive crankcase pressure.

  3. #3

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    thanks RXP6!

    Dave

  4. #4

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    Did you find solution ? I have same issue.

  5. #5

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    Nah I didnít.

    I just accept that thereís a bit of oil that gets into the inlet.

    A bit of lube never hurt anyone right??

    Although it does use more oil than I would have thought normal.

  6. #6

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    Quote Originally Posted by davus View Post
    Nah I didnít.

    I just accept that thereís a bit of oil that gets into the inlet.

    A bit of lube never hurt anyone right??
    1,do you have a catch can ?
    Although it does use more oil than I would have thought normal.
    2,how full are you filling it?


  7. #7

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    Between the two indicator marks on the dipstick.

    But it still seems to blow through a bit of oil even when the level is a little lower than the bottom mark.

  8. #8

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    Quote Originally Posted by davus View Post
    Between the two indicator marks on the dipstick.

    But it still seems to blow through a bit of oil even when the level is a little lower than the bottom mark.
    If I have mine above half it would blow into my catch can very heavily. If I keep it low it doesn't put any into my catch can. Do you have a catch can?

  9. #9

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    Nah I donít. Was thinking about putting one in but havenít really taken the time to understand what the gains are.

  10. #10

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    Its a poorly installed seal that fits on to the retainer behind the supercharger wheel, there are 2 seals, one that fits over/into the retainer and a small o-ring that fits on the shaft which holds the supercharger wheel.

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